merchen



roller D will exert a uniform pressure on I said pipe. Consequently, as the thickness of the pipe increases the exhaust opening 9 will increase in corresponding measure and therefore the pressure within the space 3 and cylinders C will be reduced, thus reducing also the pressure which is exerted by the pressure roller D. Of course this reduction of pressure, though the pressure really exerted upon rollerD is diminished, will correspond to an increaselof thickness of the pipe placed around the roller F so that during the manufacture of the tube a uniformly decreasing pressure is exerted.

In the embodiment shown in Figures 3 and 4 the small cylinders C have been dispensed with. The pressure acting upon the pistons within the cylinders A is gradually reduced, as set forth above, in relation with cylinders C. The traverse B is provided with two bearings R being substantially situated at a distance of 0.21 L from the ends of the pressure rollers D (where L means the length of the pressure rollers D). The said bearings R transmit the pressure through two small rolls E to the pressure rollers D. The pressure cylinders are'controlled in the same manner as explained with regard to Figures 1 and 2.

In the arrangement shown in Figure 5 the pressure is exerted on'the rotating roller F by 2 pressure cylinders adapted to displace themselves along two straight lines radiating from the centre of the rotating roller F. In this device 2 cross bars B are used, each carrying a set of small cylinders C. The remaining feature of this. arrange menthas already been set forth with regard to Figures 1 aiid 2.

- In the arrangement shown in Figures 6 and 7 the large roller G acting upon the rotating roller F comprises two small rollers G1 and G2 which rest upon a number of small roll couples E1 and E2. The latter are mounted upon supports 9 which are carried by a cross bars T The two pressure rollers are replaced by a single roller D whereupon are running the small rolls E which are controlled by the pistons of two small cylinders G. The small cylinders C have the same position as the supports shown in Figure 3.

Figures Sand 9 show another embodiment of the invention where the five uniformly distributed hydraulic cylinders C are carried by the cross bar'B.

Figures 10 and -11 show a modified construction wherein the pressure is exerted 1n the interior of the roller D.

The main cylinder A exerts the necessary pressure upon a shaft U rotating in the interior of roller D in which are lodged the discs V consisting preferably of bronze and mounted with the same conditions of distance as the bearings R.

fication. In this arrangement a single roller G carries the rotating roller F while only one pressure roller D is used, this roller being cont-rolled by a system Oof toothed wheels. The pressure upon the roller may be produced by setting the apparatus into the desired position by means of the pistons Within Figures 12 and 13 show still another modithe cylinders A (as described in relation with Figures 11 and 12), and utilizing the pressure of the two small cylinders C applied at a distance of 0.21 L from the ends of the above said rollers as pointed out with regard to Figure 6, or by using a set of small cylinders as described with regard'toFigures 1 and 8, or else by employing a device as pointed out in relation to Figure 3. In this manner the pressure roller will produce a pres sure which is uniformly distributed along the rotating roller F. I

The same effect may be obtained if the ressure is exerted upon the rotating roller as shown in Figures 10 and 11 by producing a gradually decreasing pressure (analogous 'to that in the cylinders C) upon the upper ends of the pistons Within the cylinders A, which exert a pressure directed from top to bottom upon the end of the pressure roller shaft D. As this pressure is exerted at a distance of 0.21-L from the end and within the interior of the )ressure roller D, the pressure is uniformly distributed on the rotating rollerF;

1. In a machine of the character described, the combination with a rotary pipe-forming cylinder, of-a pressure cylinder cooperatively related thereto, means for supplying'a plastic mixture to said pipe-forming cylinder, a hydraulic press for imparting pressure to said pressure-cylinder, and means under control of the pipe-formingoperation for controlling the pressure of the fluid supplied to said hydraulic press.

2. Ina machine of the character described,

the combination with a rotary pipe-forming cylinder, of a pressure cylinder cooperatively related thereto, means for supplying a plas-Q tic mixture to said pipe-forming cylinder, axially-spaced hydraulic presses for pressing said pressure cylinder against the pipe-formrelated thereto, means for supplying a plastic mixture to said pipe-forming cylinder, pressure distributing rollers operating upon said pressure cylinders, and hydraulic presses connected to said pressure-distributing rolls ers. Y

4; In a machine of the character described,

Dec. 23, 1930. 1 G. G. MERCHEN 1,736,216

COUNTERBA L ANCE STABILI ZER Filed 001',- 2, 1929 Invenlor G/erm 1 G. Mart/ren- A [for ne y 

